Great work, really love the design language you have used here. The piece shows a good understanding of composition and i like the way you went with a more neutral color pallet.

One minor crit, if you would call it that, would be that his left arm?, blends in a bit with the backgrounds and is a little bit hard to read. You might of intended it to be like that, so in that's case ignore my ignorant ramblings, and Keep up the really good work!